What Janey and WIChix are talking about is a Singer cabinet 304 or 306. Apparently, they are not common. I didn't understand what they were talking about either, so started searching. This will explain it:
http://ismacs.net/singer_sewing_mach...y/304_cab.html
Apparently, the 304 is wider than the 306, which, apparently, you and WIChix both have. Janey is commenting that the table was probably sold with a Singer 101 sewing machine originally.
I've never seen one of those tables, so I originally thought the one you had was missing the fold out leaf.
Congrats on the machine.
bkay